$schemamarkup = get_post_meta(get_the_ID(), 'schemamarkup', true); if(!empty($schemamarkup)) { echo $schemamarkup; }

How to Reinstall GRUB on Debian Gnu/Linux Distro

GNU/Linux Debian Fixing GRUB Guide

Hi! This tutorial will guide you step-by-step on How to Reinstall/Fix GRUB 2 in Debian GNU/Linux.

And GNU GRUB for Debian is a very powerful Boot Loader, which can load a wide variety of Free Operating Systems, as well as Proprietary OSes with Chain-loading.

And a Boot Loader is responsible of loading and trasferring control to a Kernel OS Software (such as Linux or GNU Mach).

The Kernel, in turn, initializes the rest of the Operating System (e.g. a GNU system).

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GNU/Linux Debian Fixing GRUB 2 Guide